3 papers
cond-mat.supr-con2023
Measurements of the amplitude-dependent microwave surface resistance of an Au/Nb bilayer
Thomas Oseroff, Zeming Sun, Matthias Liepe
Surface properties are critical to the capabilities of superconducting microwave devices. The native oxide of niobium-based devices is thought to consist of a thin normal conductin…
cond-mat.mtrl-sci2023
Thermodynamic route of Nb3Sn nucleation: Role of oxygen
Zeming Sun, Darrah K. Dare, Zhaslan Baraissov +3
Intermetallic Nb3Sn alloys have long been believed to form through Sn diffusion into Nb. However, our observations of significant oxygen content in Nb3Sn prompted an investigation…
cond-mat.mtrl-sci2023
Surface oxides, carbides, and impurities on RF superconducting Nb and Nb3Sn: A comprehensive analysis
Zeming Sun, Zhaslan Baraissov, Catherine A. Dukes +5
Surface structures on radio-frequency (RF) superconductors are crucially important in determining their interaction with the RF field. Here we investigate the surface compositions,…